doc: fixed checkstyle download url (#3304)
doc: fixed checkstyle download url (#3304)


rnveach/checkstyle,izishared/checkstyle,romani/checkstyle,izishared/checkstyle,nikhilgupta23/checkstyle,checkstyle/checkstyle,romani/checkstyle,liscju/checkstyle,baratali/checkstyle,checkstyle/checkstyle,baratali/checkstyle,MEZk/checkstyle,checkstyle/checkstyle,bansalayush/checkstyle,jochenvdv/checkstyle,baratali/checkstyle,checkstyle/checkstyle,MEZk/checkstyle,jonmbake/checkstyle,sabaka/checkstyle,liscju/checkstyle,sirdis/checkstyle,romani/checkstyle,AkshitaKukreja30/checkstyle,ilanKeshet/checkstyle,rnveach/checkstyle,romani/checkstyle,vboerchers/checkstyle,rnveach/checkstyle,ilanKeshet/checkstyle,sabaka/checkstyle,vboerchers/checkstyle,MEZk/checkstyle,sharang108/checkstyle,romani/checkstyle,sharang108/checkstyle,AkshitaKukreja30/checkstyle,rnveach/checkstyle,rnveach/checkstyle,sabaka/checkstyle,bansalayush/checkstyle,izishared/checkstyle,bansalayush/checkstyle,AkshitaKukreja30/checkstyle,nikhilgupta23/checkstyle,jochenvdv/checkstyle,vboerchers/checkstyle,sirdis/checkstyle,checkstyle/checkstyle,liscju/checkstyle,sharang108/checkstyle,checkstyle/checkstyle,rnveach/checkstyle,romani/checkstyle,jochenvdv/checkstyle,nikhilgupta23/checkstyle,jonmbake/checkstyle,ilanKeshet/checkstyle,jonmbake/checkstyle,sirdis/checkstyle